Unbreakable writing instrument and method of making same



J. F. HANSEN Feb. 4, 1930.

UNBREAKABLE WRITING INSTRUMENT AND METHOD 0F MAKING SAME l Filed Sept. 25. 1926 2 Sheets-Sheet l W W l J. F. HANSEN Feb. 4, 1930.

UNBREAKABLE WRITING INSTRUMENT AND METHOD OF MAKING SAME Filed Sept. 25. 1926 2 Sheets-Sheet 2 Ira/@mrz Juwzfmmm vsovi f 35 face attrae Patented Feb. 4, 1930 JULITrsl r. HANSEN, or RvANsrrO CHICAGO, ILLIN N, ILLINOIS, AssIGNOR 'ro THE WAHL COMPANY, or oIs, AOORPORATION OF DELAWARE UNBBEAKABLE WRITING INSTRUMNT AND METHOD 0F MAKING SAME Application tiled September rlhis invention relates to 'writing instru-r ments in general of a kind that has an/internal metal tube about which is disposed a nonme tallic sleeve.

As is well vknown anall metal barrel, cap, or body portion, ufor Writing instruments, such as fountain pens, mechanical, or other pencils, and the like, possesses great Strength, but it is not as comfortable on the fingers, and is notas attractive as those made of non-metallic material such as hard or soft rubber or rubber compositions, casein, shellac compositions, paralin, karolith, bakelite, or the many other ymaterials capable of-v use in forming such articles. However, pens, pencils, or the like, when made of the latter recited materials,.while pleasing to the sight and comfortable to the ngers, do not vpossess a very great amount of strength and are more or less easily broken. This invention .contemplates -a combination of these Various features.

Among the Objects of this invention is to produce a tubular structure for a Writing instrument having an interior of' metal and an exterior of` a non/metallic material such as rubber;` rubber composition, casein, shellac compositions, paralin,.karolith, bakelite, or other suitable non-metallic materials. t

Another object of this invention is to prode a novel method for constructing an .instrument of the character described.

' Another object of this invention is to provide a body portion for a Writing instrument which Will have-a non-metallic eXterior'surable in use duleto the incorporation therein'. of aJ metal tu e.

A further'object is the provision of novel means for securely fastening the outer nonmetallic portion of the inner metallic tube.

Further objects, advantagesv and capabilities of. this invention will later become more readily, apparent.- Y My invention further resides in thecombitive in appearance and 'comfort- ,but which will have great Strength 2 5, 1926. Serial No. 137,638.

nation, construction and arrangement vof parts illustrated in the accompanying drawings, and While I have shown therein a preferred embodiment I wish it understood that the Same is susceptible of lmodification and ychang without departing from the spirit of my invention.

Fig. 1 is a longitudinal central section of the non-metallic sleeve.

Fig. 2 is a longitudinal central section of the metallic tube'.

Fig. 3 is a longitudinal central sectlon showing the metallic tube partially inserted Withinthe non-metallic sleeve.

Fi 4 is a view partly in section illustrating t e use of this reinforced .barrel 1n connection With a fountain pen partly assembled.

Fig. 5 is a view partly in section illustratvingthe, fountain pen of Fig. 4 assembled.

F 6 illustrates a cap for afountain pen constructed in accordance with my invention.

Fig. 7 isa view of a fountain pen with the cap in Section illustrating how a leak-proof joint maybe formed in this cap to cooperate with the pen lretaining section of a fountain pen.

- Fig. 8 is a side elevation of a pencil having a barrel portion composed of a non-'metalllc outer sleeve and a metallic inner tube.

F'g. 9"is a Side elevation of the barrel portion of the same pencil.

Fig. 10 is a longitudinal central sectional view of the body portion of the pencil illustrating the inner metallic tube and the outer non-metallic sleeve intimately interengaged.

'- Referring in greater detail to the drawlngs a sleeve 1 may be formed in any desired man# 4, ner in suitable length ofrubber, either hard or soft, bakelite, casein, paralin, karolith,

. shellac composition, or other suitable' nonmetallic material. In' using hard rubber` I may elect any of the several colors lor combination of colors which are possible-.of use in hard rubber. When, however, soft rubber is used a.' greatervariety of colors or combma- 90 tions of colors is available for use.Y In using casein or shellac composition I may employ any of a` large variety of colors and combination ofcolors; A grat variety of non-metallic materials are available for use in this outer i sleeve and with many of these materials it is possible to employ any of a large variety of colors, making it possible to obtain a considerable degree of individuality in the external appearances of writing instruments, and' when combining this outer sleeve with an iny ner metallic tube it is found that while I at.-

tainthe advantage of variety and beauty in external appearance and comfort in use I combine the same with very considerable strength, thus resulting in an attractive looking but substantially nn-breakable writing l sleeve 1.

` writing instruments, such as the pencil shownvin Figs. 8, 9 and 10, or for other structures in which-thiscombination of materials would bev desirable and suitable.

As one method of assemblyV of the tube 2,

Pandthe sleeve 1, when the outer sleeve is made of rubber orvother non-metallic materials that will dissolve in benzol, or the like; I dip the tube 2 in benzol and insert it into the sleeve 1. The benzol, being asolvent l of rubber, orother material referred to, softens the interior surface of the non-metallic sleeve, and when' this surface comes in contact with the metal a ti'ght .union and intimate contact is formedthereinbetween. VIn

" order to .heighten the effect of this union` I may roughen the surface of the tube 2 previous to insertion into the sleeve 1. However, it is notv indispensible that this inner tube be roughened. In order to close the endof this tubular composite structure a plug 3 may then be dipped into benzol and inserted in the end ofthe structure to form a tight union as shown. This plug *may be made v4of metal or a non-metallic material and may have the same color as the main body Aportion of. the instrument or it may have a different color, according to fancy.

Anexpansible ink reservoir 4 Vattached to apen section 5 is assembled with a feed bar 6 and a nib 7 and may then be inserted into the body ofthe fountainY pen and secured therein in any suitable manner.

The cap for this fountain pen may be prof 5 'duced in a manner similar to that used in the 'construction of the main body portion of the fountain pen.y A metal tube 8 may be inserted into a non-metallic sleeve`9 in such a way as to provide for intimate-iDter-nbarrel vof the fountain pen.

fit within the Y' to spin or otherwise form an annular shoulder within the cap by pressing the metal tube 'inwardly at the point 10 for the purpose of providing a shoulder against which the outer end 11 of the pen section may be positioned to form a leak-proof joint. Suitable threads 12 may be provided on the interior of the cap, tooooperate with threads 13 on the barrel -of the fountain pen. The `metal tube used in this cap may be made of a soft metal so that it will not scratch the exterior of "the'barrel portion; however, the use of soft metal in the cap is not necessary. The 'end plug 14 for closing the end of the cap may be inserted inthe same manner in which the plug' 3. was inserted in the end of the main Referring particularly to Figs. 8, 9 and 10 7a disclosure is here-made of apencil having a metal tubel intimately associated with a. non-metallic sleeve 16, there being the same r intimate inter-engagement between the tapering portion 17 of the metal tube and the corresponding tapering portion 18 of the nonmetallic sleeve. The tube and sleeve may be assembled in anysuitable manner, as by in sertion,` of the tube into' the sleeve, or by forming the non-metallic material, while in softened condition, about the metallic tube 15. The outer surface of the tube 15 may l be roughened in order to heighten the effect of intimate inter-engagement of the adjacent surfaces of the tube vand sleeves. Fig. 8 illustrates how the body portion illustrated in Figs. 9 and 10 may be incorporated into a pencil having a tip and a cap 20.

It will'thus be seen that I have produced a writing instrument having a non-metallic outer covering that can be'mademuch more attractive in appearance and comfortable in use than if the outer portion of the device was metal, and I have at the same time made the same practically non-breakable because of the incorporation therein of the metal tube. It has been found by actual demonstration that a writing instrument made in accordance with this invention can be forcibly thrown upon the Hoor, or from a considerable height lwithout breaking the instrument.

ioo

Having shown and described my inven i tion, I claim 1. Thatpart o f'the method of producing a composite tubular structure which consists of softening the interior of a non-metallic 1 sleeve, and of inserting therein a metal tube,`

thereby forming a tight union between said sleeve andl tube; I

2. That part of the method of producing a composite tubular structure which consists of softening the interior of a non-inetallic sleeve, of rougheningv the exterior of a metallic tube, and of inserting said tube into In witness whereof, I hereunto' the exterior of ametallic tube Lm metallic material, to thereby Vforme tight union between said tube` and sleeve.

my name to th subscribe is specification.

, JULIUS E. HANSEN., 

